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Manitowoc Q400 flaker

Hi,
I am working on a Manitowoc Q406A flaker ice machine that is producing small, hard pellets instead of flakes. I've tried a cleaning cycle, but no luck. Any thoughts? We have several of these machines in our department and they are all around 6 years old and I'm starting to see variation in the shape and size of the flakes.

At the main web site you can find owners manuals that explain how to clean a machine or find a contractor who can do it for you. Six years is a long time without a real cleaning. I believe they recommend at least twice a year at the very least